Novel basic, cationic dyestuff

ABSTRACT

A novel dyestuff having the general formula   (WHEREIN R1 represents an alkyl or an acyl group, R2 represents hydrogen, an alkyl or an aryl group, X represents hydrogen or halogen atom or an alkyl or an alkoxy group, A represents benzene or naphthalene nucleus which may contain one or more substituents of an alkyl, an alkoxy, nitro amino, substituted amino, or phenoxy group or halogen atom and Y represents an anion) and which dyestuff can dye polyacrylonitrile and cellulose acetate fiber with excellent fastness to light and heat.

United States Patent 11 1 Fujino et al.

[ June 26, 1973 NOVEL BASIC, CATIONIC DYESTUFF [73] Assignee: Mitsubishi Chemical Industries,

' Limited, Tokyo, Japan [22] Filed: Aug. 26, 1970 [21] Appl. No.: 67,250

[30] Foreign Application Priority Data Sept. 3, 1969 Ja an; 44/69903 Jan. 20, 1970 Japan 45/52031 Feb. 6, 1970 Japan 45/10468 [52] US. Cl. 260/326.15, 8/177 R, 8/178 R, 8/179, 106/176, 260/141, 260/165, 260/240 I G [51] Int. Cl C07d 27/38 [58] Field of Search 8/177 AB; 260/326.11, 240 G, 566 B, 326.15

[56] References Cited' UNITED STATES PATENTS v 3,331,831 7/1967 Raue et a1 260/162 3,345,355 10/1967 Raue et a1 260/165 FOREIGN PATENTS 0R APPLICATIONS 570,686 2/1959 Belgium OTHER PUBLICATIONS Grammaticakis,'Comptes Rendus, vol. 226, pp. 189-1- Smith, The Chemistry of Open-Chain Organic Nitrogen Compounds, Vol. 11, pp. 40 and 171-172 (W.A.

Benjamin, Inc. N. Y.), published 1966.

- Primary Examiner-John D. Randolph Attorney-Oblon, Fisher and Spivak 57 ABSTRACT A noy eldyestuff having the general formula CH3 CH3 e C-( J=N-l I-A Y 2 Claims, No Drawings NOVEL BASIC, CATIONIC DYESTUFF dye a synthetic fiber, especially acrylic and cellulose acetate fiber in yellow to orange shade with good fast? ness, especially to light and to heat. The dyestuff is shown by general formula I (wherein R represents an alkyl or'an acyl group, R

represents hydrogen, an alkyl or an aryl group, X represents hydrogen or halogen atorn or an alkyl or an alkoxy group, A represents benzene or naphthalene nucleus which may contain one'or more substituents of an alkyl, an alkoxy, nitro amino, substituted amino, or phenoxy group or halogen atom and Y represents'an anion). v

The examples of alkyl group represented by R in the above formula include lower alkyl such as methyl, ethyl and propyl group and the example of acyl group represented by R includes acetyl group. The examples of alkyl and aryl group represented by R include lower alkyl group, such as methyl, ethyl, propyl and butyl group, substituted lower alkyl group, wherein said sub stituents are one or more substituents selected from the group of halogen, cyane, carbomoyl,hydroxyl,phenyl, lower alkyl,substituted amino,and alkoxy, such as cyanoethyl, carbamoylethyl, chloroethyl, oxyethyl, dioxypropyl, methoxyethyl, ethoxyethyl, -chloro-B- hydroxy propyl, y-methoxy-B-hydroxy propyl, B-di-' methyl aminoethyl and B-diethyl aminoethyl, and aryl group such as benzyl group. The examples of the member X include hydrogen atom, a lower alkyl group, such as methyl, ethyl, and propyl group, a lower alkoxy group, such as methoxy, and ethoxy group, nitro group and a halogen atom, such as chlorine and bromine. The member A is a benzene or naphthalene nucleus and may contain one or more of substituents of a lower alkyl group, such as methyl and ethyl group, a lower alkoxy group, such as methoxy andethoxy group, aryloxy group, such as phenoxy group, nitro group and halogen atom such as chlorine and bromine, alkoxycarbonyl group and amino group or substituted amino group wherein said substituents may be alkyl and acyl group. More particularly, the examples of the member A include phenyl, 2-tolyl, 4-tolyl, 2-ethyl phenyl, 4- ethyl phenyl, 2-methoxy phenyl, 2-ethoxy phenyl, 4- methoxy phenyl, 4-ethoxy phenyl, 2,4-dimethoxy. phenyl, 2,5-di'methoxy phenyl, 4-phenoxy phenyl,- 4- chlorophenyl, 4-nitrophenyl, 4E thoxycarbo'nyl phenyl, 4-dimethylamino phenyl, 4-acetylamino 'phenyl, trimethyl phenyl, 2-chloro-4-methoxyphenyl, 3-chloro-4- methoxy phenyl, l-naphthyl, 2-naphthyl, 7 -methoxy-lnaphthyl, 4-methoxy-l-naphthyl, S-nitrQ-I-naphthyl, 5-chlorol -naphthyl, 5-bromo-1 -naphthyl, 7-chloro-2- naphthyl and 7-bromo-2-naphthyl groups. The examples of anion Y include formate, acetate, oxalate, ptolu ene sulfonate, sulfamate,N-substituted sulfamate,

phosphate, alkali metal phospate, such as sodium phosphate halide, acidic phosphate of polyhydric alcohol, sulfate, alkyl sulfate, perchlorate, zinc halide such as zirrc chloride and hydroxyl anions.

There are various ways of preparing the novel dyestuff represented by general formula I according to this invention, but it is conveniently prepared by either condensation of an oxime or a nitroso compound with a hydrazine or a salt thereof, or alkylation of an azo'compound or of a hydrazone compound.

The details of such reactions are explained hereinat ter.

CONDENSATION PROCESS The dyestuff represented by general formula I is prepared by condensation of an oxime compound having general formula II g (in; i III with a hydrazine compound having general formula IV or a salt of hydrazine compound having general'formula V YlI-lI2N-I IA V in the presence of an acid material, if necessary; in the above fomulae R, R X and A have the same meanings as in the foregoing and Y and Y represent an anion, respectively.

The condensation reaction of such oxime or nitroso compound with such hydrazine compound or salt thereof is conveniently carried out in an amount of the hydrazine compound or salt thereof of stoichiometric or excess and the temperature at which the reaction is effected generally ranges from 0 to 150C and preferably from room temperature'to C.

Although the condensation reaction can be carried out in the absence of any solvent, it is preferred to ef feet the reaction in the presence of a solvent or a diluent for either one or both reactants. Such solvents include an alcohol, such as methanol, ethanol, butanol, isopropanol, ethylene glycol, glycerol, polyethylene glycol, and thiodiethylene glycol; an ether, such as ethylcellosolve, diethylene glycol butyl ether, tetrahydrofuran and dioxane; bis-oxyethyl sulfone, dimethyl sulfoxide, formamide, dimethyl formamide, diethyl formamide, tetramethylene sulfone, hexamethyl phosformamide, aor ,8- alkoxy alkyl nitrile, water and a mixture thereof, and such diluents include benzene, ethylacetate and tetrachloroethane.

Further, the condensation reaction can be accelerated by removing hydroxylamine formed during the reaction fromthe system, for example, applying vacuum conditions to the reaction mass, such as a vacuum of 70mmHg at a temperature over 60C.

It is also preferred to add to the system either a basic substance, such as triethyl amine, pyridine and piperidine or an acid substance, such as hydrochloric, acetic and phosphoric acid in addition to such solvent or diluent, in order to effect the reaction. Especially, in case of the condensation of such nitroso compound and hydrazine compound, there is necessary to add such acid substance.

After completion of the condensation, there are various ways to recover the resulting dyestuff from the re action system. In case the solvent is employed, (1) the solvent is distilled out to recover the dyestuff, or (2) I the mixture is allowed to cool to precipitate the dye- (L1H: VI

(wherein X and R have the same meanings as in formula I), the process itself being well-known. The examples of said oxim compound include 1,3,3-trirnethyl-2- methyl oximinomethyl indoleninium chloride,

1,3,3-trimethyl-2-methyl oximinomethyl-S-chloro indoleninium clhoride, 1,3 ,3 -trimethyl-2-methyl oximinomethyl-S-methyl indoleninium chloride,

1,3,3-trimethyl-2-methyl oximinomethyl-S-methoxy indoleninium chloride, 1,3,3-trimethyl-2- oximinomethyl-S-butyl indoleninium chloride,

l,3,3-trimethyl-2-(methyl oximinomethyl) indoleninium chloride, l,3,3-trimethyl-2-(acetyl methyl oximino-methyl) indoleninium chloride and 1,3,3-trimethyl-2-methyl oximinomethyl-S-nitro indoleninium phosphate.

The nitroso compound having general formula (III) is prepared by bringing an aqueous solution of the ox'ime compound having general formula (II) into alkaline condition and separating the precipitate thus formed. The examples of such nitroso compound include l,3,3-trimethyl-2-nitrosomethylene indoline, 1,3,3-trimethyl- 2-nitrosomethylene-S-chloro indoline, l,3,3-trimethyl-2-nitroson1ethylene-5-methoxy indoline, l,3,3-trimethyl-2-nitrosomethylene-5-methyl inl ,3,3-trimethyl-2-( methyl-nitrosomethylene) 4 N-(4-chloro)-phenyl-N-methyl hydrazine, N-phenyl-N- ethyl, hydrazine, N-phenyl-N-cyanoethyl hydrazine, N-phenyl-N-chloroethyl hydrazine, N-phenyI-N-(B, 'y-dihydroxy)butyl hydrazine, N-(4-methyl) phenyl-N- methyl hydrazine, N-( 4-methyl) phenyl-N ethyl hydra-' zine, N-(4-methoxy) phenyl-N-methyl hydrazine, N-(4-ethoxy)phenyl-N-methyl hydrazine, N-(4- phenoxy) phenyl-N-methyl hydrazine, N-(3-chloro-4- methoxy)phenyl-N-methyl hydrazine, N-(4- ethoxycarbonyl)phenyl-N-methyl hydrazine,- N-(4- dirnethylarnino)phenyLN-methyl hydrazine,- N-(4- acetylamino) phenyl-N-methyl hydrazine, N-(4-methoxy) phenyl-N-ethyl hydrazine,

N-(4-ethoxy)-phenyl-N-ethyl hydrazine, N-(2,4,6- trimethyl)-phenyl-N-methyl hydrazine, N-(2,4- dimethoxy) phenyl-N-methyl hydrazine, N-(4-chloro)-phenyl N-methyl hydrazine,

N-(4-nitro)phenyl-N-methyl hydrazine, N-B-naphthyl- N-methyl hydrazine, N-(4-dimethylamino)B-naphthyl hydrazine, N-Bnaphthyl-N-ethyl hydrazine, N-benzyl- N-phenyl hydrazine, N-(B-dimethylamino)-ethyl-N- phenyl hydrazine, N-(B-diethyl amino) ethyl-N-phenyl hydrazine and N-a-naphthyl-N-methyl hydrazine. Alkylation of an azo and a hydrazone compounds Alternatively, the dyestuff having general formula I according to this invention can be prepared by alkylation reaction of an azo compound having general formula VII (in the above formulae R, A and X have the same meanings in general formula I and Y represents an anion).

The azo compound and hydrazone compound employed as raw material for the production of the dyestuff according to this invention can be prepared by the coupling reaction of 2-methylene-indoline compound havinggeneral formula VI above mentioned or a com- VII VIII

pound having general formula IX cm om o N JJlIa IX with a diazo compound of an aromatic amine which may contain one or more of nonionic 'substituents. (wherein R and X have the same meanings in formula I and Y represents an anion). This coupling reaction compound represented by general formula VII where the condition is alkaline.

The dyestuff according to this invention is obtained by reacting the azo and hydrazone compounds dissolved in a solvent or diluted with a diluent with an alkylating agent at a temperature of from room temperature to 150C. The examples of said alkylating agent include, for example, a dialkyl sulfate, such as dimethyl sulfate and diethyl sulfate, an alkyl halide, such as methyl iodide, ethyl iodide, methyl bromide and ethyl bromide, and an alkyl p-toluene sulfonate, such as methyl p-toluene sulfonate and ethyl p-toluene sulfomate. The amount of such alkylating agent is stoichiometric or more. In the latter case, an amount in excess of the stoichiometric amount acts as a diluent.

The examples of such solvent and diluent include methanol, ethanol, benzene, toluene, xylene, chlorobenzene, nitrobenzene, acetone, dimethyl formamide, chloroform and carbon tetrachloride.

In the alkylation reaction, if desired, a deacidifying agent, such as magnesium oxide can be present in the system.

The anions represented by Y, Y and Y are selected depending upon the reagents employed in such diazotization, coupling, alkylation and post treatment; for practical purposes they are selected from the anions mentioned above in connection with the condensation process.

The reaction mixture containing the object dyestuff is subjected to after treatment, that is salting out or double salt forming treatment as in the case where the oxime or nitroso compound is reacted with the hydrazine compound or the salt thereof to obtain the dyestuff.

The dyestuff obtained from both processes can be purified by dissolving it in hot water, contacting with an absorbent, such as active carbon, filtering out and precipitating again and recovering the dyestuff.

The dyestuff according to this invention is a basic dyestuff and is readily soluble in warm water and an aqueous acid solution. Thus, the dyestuff can dye various synthetic fibers, especially polyacrylonit'rile, polyester and cellulose acetate fibers in neutral to acid dyebath and with printing paste. Such synthetic fibers include also a blend and a mixed fabric of such synthetic fiber and other fiber, such as cotton, viscose rayon, wool, polyester ether and polyamide.

In dyeing, the fiber is treated in dyebath under new tral to slight acid condition containing the dyestuff according to this invention at a temperature of from room temperature to 100C, preferably to. C, the temperature at which dyeing process is effected, of course, varies depending upon the sort of synthetic fiber to be dyed and the presence or absence of an assistant. Where the dyeing is carried out under pressurized conditions a dyeing temperature over lO0C can be successfully employed. In the operation, any known dyeing assistant, such as an organic and inorganic acid, a salt thereof, a carrier, a retardant or leveling agent and an organic solvent can be used.

In printing, printing paste is prepared f rom the dyestuff, a thickener, a dissolving assistant, an accelerator, a carrier, a stabilizer and an antireducing agent and the fiber is printed with such paste and heat treated to effect the fixation of dyestuff to the fiber.

The dyed material obtained as above is in brillant yellow to orange shade and possesses good fastness, especially to light, to heat and to potting.

Dyestuffs similar to those of this invention have been suggested. All of such known dyestuffs contain a carbon atom which is attached to 2-position carbon in indoline nucleus is linked to hydrogen atom and nitrogen atom of the residue of hydrazine, whereas in the dyestuff according to this invention such carbon atom attached to 2-position carbon in indoline nucleus is linked to a lower alkyl group (in general formula the member of R) and nitrogen atom of the residue of hydrazine. This difference accounts for the superior fastof prior art as shown in following Table 1.

industrial Standard (J IS) L-1044 using the Carbon Ar n ethod.

age are expressed by weight and the absorption maximum ()tmax.) is as measured in methanol solution containing 0.1 percent of acetic acid.

EXAMPLE 1.

l ,3 ,3-Trimethyl-2-(methyl-oximinomethyl) indoleninium chloride (2.8 parts) and N-phenyl-N- methyl hydrazine (1.5 parts) were mixed and dissolved in tetramethylene sulfone (20 parts) at 100C and the solution was stirred at that temperature for 8 hours to effect the condensation reaction. After completion of the reaction, the reaction mixture was diluted with warm water of 60C (20 parts) and concentrated hydrochloric acid (5 parts), and, after allowing to, cool to 20C, the solution'was salted out by addition of sodium chloride (20 parts) and zinc chloride (5 parts) to separate the cyrstals of yellowish orange,'which were then filtered out. A dyestuff having the following formula and A max. of 433 mg was obtained:

acid (2 parts) and boric acid (70 parts) in such amount that the resulted dyestuff composition gave a dye concentration on dyed fabric the same as that of Cl. basic yellow 1 l. The dyestuff composition (0.2 part) was dissolved in hot water 10 parts) and diluted with water (500 parts), then acetic acid (0.1 part), sodium acetate (0.15 parts) and a nonionic surfactant (0.l5 parts) were added to the solution to prepare a dyebath. Polyacrylonitrile fiber (20 parts) was immersed in the bath the temperature of which was then raised to 90C over 40 minutes and dyeing was effected at that temperature for 1 hour. The dyed fiber was washed with water, treated in a soaping bath (500 parts) containing 0.5 percent of a detergent at 80" to 90C for minutes, washed again with water and dried. A polyacrylonitrile fiber having uniform and brillant greenish yellow shade with excellent fastness to light was obtained.

Cellulose acetate fiber (20 parts) was dyed as in the case of polyacrylonitrile fiber to obtain dyed fiber having uniform and brilliant greenish yellow shade.

Basacryl salt A N (available from Badische Anilin &

Soda Fabrik A.G.) (0.4 parts) and Levegal PAN (available from Farbenfabriken Bayer A.G.) 1.0p'art), were added to the dyebath in the same was as mentioned above and the same dyeing procedures were repeated to obtain a dyed material having uniform and brilliant greenish yellow shade.

EXAMPLE 2.

l,3,3-Trimethyl-2-(acetyl-oximinomethyl) indoleninium chloride (2.8 parts) and N-(4-methyl)-phenyl-N-methyl hydrazine (1.5 parts) were employed and. processed them according to the procedures in Example l to obtain a dyestuff having the formula:

-orn 211013 N This dyestuff could dye polyacrylonitrile fiber in greenish yellow shade. Examples 3 to 26.

Various oximino compounds and various hydrazine compunds in equimolarratio 'were dissolved in tetramethylene sulfone at 100C and continued agitation for 8 hours. After completion of the reaction, the reaction mixture was diluted with warm water and hydrochloric acid, allowed to cool to 20C and salted out with salt to recover dyestuff thus obtained.

The reactants, kmax. of dyestuff and shade on polyacrylonitrile are given in Table 2.

TABLE 2 Example Oximino Hydrazlne Shade x max.

3 CE; CHa (3H3 Reddish bellow 452 c pm 6 HrN-N-Q-OCHi C-C=NOH c1 4 4 CH3 4..-. Sameasabove (3H5 Yellow-. 435

mN-N--cl 5. d0 ([31 1; I .-.-do 442 HzN-N-Q-CH: I

a. -.do on, I Reddlshbellow 455 7 .do (31h -d0 a mNN-ocm s do CH; 1o-. 460

TAB LE 2 Continued Example Oximino Hydrazine Shade A max.

9 dn (3H Greenlsh yallow 430 HzN-N-Q-NO:

1O do (3H Reddlsh yellow 457 HzN-N 11 do (I311; Yellow 445 12 do (11H; Greenish yellow 420 HzN-N 13 --do ([JH; Reddlsh ye1low. 458

' HzN-N- l CI HzN-N- 0 CH3 7 15 "1. :dB 3Y5 ereenagmgmnow 435 HzN-N- 16 .do 3H1 Yellow 440 H1NN--C2H5 17 Cg; OHa 6B Reddlsh-yellow 454 mN-N o CH;

CzH5

CQ=NOH 01 f CH;

18 CH; CH; 63 Same as above do 452 CC=NOH 01 10 CI\-I; /CH; 63 I 11; Grcenlsh-yollow. 433

c lhN-NCH1 C2H5 (Ina V C-C==NOH 01 T CH3 TABLE 2 Continucd Example ximino Hydrazine Shade max CH CH; 69 CH l Yellow Y 4 17 C CH HzN-N- CH;

C-C=NOH Cl 21 CE; CH; 69 Sameasabove. do 448 C CH a Cl e CC=NOH Cl i CH:

22 r CH3 CH3 G) d0 \C/ CH:-

CH; I e CC=NOH Cl HzN-N- 23 Same as above I]! Yellowlsh orange 460 HzNN-OOHa 24.. n /CH3 Reddlsh yellow 454 THaCHzN-CHB NzH-N-O-OCH;

25 TH CHtO CH; Greenlsh yellow 425 2 .do.. C H4C ONHZ Reddlsh yellow. 455

HgN-N EXAMPLE 27. 50 95 to 100C; and methylation was 'cw'ieasut'a iii'a't A solution of p-anisidine (1.3 parts) in a mixture of 35 percent hydrochloric acid (3.0 parts) and water parts) was cooled and 9.3 percent aqueous sodium nitrite solution (7.5 parts) was added to the solution to effect diazotization. The resulting mixture was added to a solution of l,3,3-trimethyl-2-ethylidene indoline (2.0 parts) in a mixture of percent hydrochloric acid 1.2 parts) and water (20 parts) while cooling, and the pH value was adjusted to 3.5 4.0 by means of an aqueous sodium acetate solution to effect the coupling reaction. Upon completion of the coupling, the resultant solution was brought to alkaline by addition of aqueous sodium hydroxide solution and the azo compound thus precipitated was filtered out.

Into a solution of the azo compound (1.5 parts) in dimethyl formamide (3 parts) was added magnesium oxide (0.5 part) and then dimethyl sulfate (4 parts) at dyestuff (1 part) having the following formula and being A max. 452 mg. was. obtained.

I Ulla A reddish yellow shade of excellent fastness to light and to heat was obtained when the above dyestuff was applied to polyacrylonitrile fiber.

EXAMPLE 28 and the pH value of the system was adjusted to 3.5 4.0

by means of aqueous sodium acetate solution to effect coupling reaction. After completion of the coupling, the reaction system was diluted with water (300 parts) thereby a salt of hydrozone compound (1.2 parts) was recovered by filtering out, washing with water and drying at 50C.

This salt was mixed with dimethyl sulfate (6.0 parts) and stirred at 90 100C for 12 hours to effect methylation. After completion of the reaction, the resulting mixture was poured into water (300 parts) followed by stirring at 60C for 1 hour and filtering out. A crude dyestuff was separated from the filtrate by salting out by addition of sodium chloride (20 parts) and filtering out. The crude dyestuff was dissolved in water (300 parts) and the aqueous solution was repeatedly washed with chlorobenzene (30 parts each) to remove unreacted raw materials from the crude dyestuff. Then the dyestuff dissolved in the aqueous layer was salted out by addition of sodium chloride (10 parts) and zinc chloride (2 parts), filtered out and dried.

. A dyestuff of the following formula and having )tmax. of 433 mp. was obtained:

on. air. e"

EXAMPLE 29 A solution of p-chloroaniline (1.3 parts) in a mixture of 35 percent hydrochloric acid (3.3 parts) and water 50 parts) was cooled and then 7.8 percent aqueous sodium nitritesolution (10.9 parts) was added to the solution to carry out diazotization, followed by decomposing an excess of sodium nitrite by means of sulfamic acid.

The resulting mixture was added to a solution of l,3,3-trimethyl-2-ethylidene indoline (2 parts) in a mixture of acetic acid (5 parts) and water parts) while being cooled, and the pH value of the system was adjusted to 3.5 4.0 by addition of aqueous sodium acetate solution to effect coupling reaction. After completion of the coupling, the solution was brought to alkaline by addition of 28 percent aqueous ammonia and the azo compound precipitated was filtered out and dried.

This azo compound (1.3 parts), methanol 10 parts) and methyl bromide (2.0 parts) were charged in an autoclave and methylation was carried out at C for 3 hours. After completion of the reaction, the reaction mass was poured into water (100 parts) and, then 4 percent aqueous sodium hydroxide solution (40 parts) was added to the solution and the mixture was stirred at a room temperature for 1 hour, thereby the precipitate thus formed was filtered out. The resulting wet cake was admixed with sulfamic acid (2.0 parts) and dried. The product was a dyestuff having the following formula and A max. of 435 mu.

A yellow shade of excellent fastness to light and heat was obtained when thp dyestuff was applied to polyacrylonitrile fiber.

1n the procedures above-mentioned, the sulfamic acid was replaced by oxalic acid to obtain a dyestuff as oxalate.

EXAMPLE 30 p-Anisidine (1.3 parts) and l,3,3-trimethyl-2- ethylidene indoline 2.0 parts) were employed and the procedures in Example 27 were repeated to obtain an azo compound.

A solution of the azo compound (1 part) in toluene (5 parts) was admixed with dimethyl sulfate (4 parts), the mixture was heated at C for 15 hours under agitation to carry out methylation. The reaction mass was poured into warm water, then the dyestuff dissolved in an aqueous phase recovered was salted out by addition of sodium chloride, filtered out and dried at 50C.

The resulting dyestuff was substantially the same as that prepared in Example 27.

EXAMPLES 31 41 A20 compounds were prepared according to the procedures in Example 27 except that the aromatic amines given in the following Table were diazotized and coupled with l,3,3-trimethyl-2-ethylidene indoline.

Magnesium oxide (0.5 part) was added to a solution of each of the azo compounds (1.5 parts) in dimethyl formamide (3 parts), the resulting mixture was admixed with diemthyl sulfate (4.0 parts) at 95 100C and methylation was carried out at that temperature for 3 hours under agitation.

After completion of the reaction, the reaction mass was poured into warm water (100 parts), and the mixture was contacted with active carbon while still warm and filtered. out. The dyestuff presented in the filtrate was salted out by addition of sodium chloride'and filtered out.

The crude dyestuff so obtained was. dissolved in water (100 parts) and chlorobenzene (20 parts) was added to the solution while being stirred, thereby unreacted raw materials were brought into the chlorobenzene. The dyestuff dissolved in the aqueous phase re-,

17 18 covered was salted out by addition of sodium chloride mined by means of thin layer chromatography were 0b- (15 parts). The dyestuffs given in the Table as detertained.

TABLE 3 Amax. Example Amine Dyestufi Shade (m 31 r CH3 CH3 G Yellow..- 442 H N- CH3 \C/ CH3 CH3 I I 9 CC=NN CH; 01

III CH3 CH3 CH3 6) Reddish 455 32 HzN 002115 yellow.

- CH; 0m

/C-C=N-N- 002m 01 f 0H,

33 ()CH3 CE: /CH3 6) d 0 453 0 OCH; HzN-C OCH; CH OH;

I 1 I e /C-C= OCHa G1 I CH:

34 0 H3 0 H3 G Yellow- 445 H2N 0- \C/ Y m 2113 v I 01 If CH:

' 35.01:: Tr on, on; ea .do 150 0 Cl HzN- OCH; CH3 CH3 l I 9 OC=NN OCH; Cl v v I? CH! CH; CH, ea Greenlsh 43o HzN- N 0 2 \C yellow.

7 0H, OH;

I I %C--C=NN N01 01 xii I- CH;

37 r- CH CH "ea Reddlsh 45a HzN 0 a yellow;

' Cm 0113 I C-( J=NN 019 N 1 JHa 0H, cm' "a; Gree'nIBh 420 HzN- \C/ 1 yellow. 7

CH; CH,

I I C-I=NN- 01 I CH3 TABLE 3 -Continued Example Amine Dyestufi Shade A $1 1 5) HZN 01 i EL/ a; 3 519333 458 C-C=NN A c1 01 k l CH:

n A. W r a r. 40 Z I \a s 69 Yellow--. 432

/C\ CH3 TH:

C-C=N-N -cHl oi 41 CH3 C s a Greenlsh 456 H HN T T BC a yellow.

/CC=N-N Gl i CH;

The dyestuffs can dye polyacrylonitrile fiber in the 3 9 shades given in the Table with excellent fastness to light 0 Ulla (32".; and to heat. Example 42. I I 9 Following the precedures in Example 27 but p- C G=N N ethylaniline (1.2 parts) was diazotized and coupled 35 with l,3,3-trimethyl-2-ethylidene indoline (2.0 parts) 1 to prepare an azo compound.

The azo compound was subjected to methylation in an excess amount of methyl p-toluene sulfonate at and 100C for 4 hours under agitation. After completion of the reaction, the reaction mass was poured into warm W v water of 60C (200 parts), the mixture was stirred at CH3 CH3 that temperature for 2 hours and allowed to stand and C to cool; then the dyestuff in the aqueous phase recov- C113 CalI ered was salted out by addition of sodium chloride (10 r 0,r1 ZnCh parts) and zinc chloride (5 parts), filtered out and dried at C. N

The dyestuff thus obtained has the following formula and )tmax. of 440 mp.. 50

CH3 '7 CH3 I i V 69 M A yellow shade having excellent fastness to light and heat was obtained when polyacrylonitrile was dyed CH3 cm with each dyestuff.

| e C(,:IFN-N- (1zllr, ZHCIJ 5s N Following the procedures in Example 27, various (Jill diazo compounds were obtained by diazotizing various aromatic amines and coupling with various indoline A yellow shade having excellent fastness to light and compounds. the raw materials and the products being to heat was obtained when the dyestuff was applied to given in the following Table. Then each diazo compolyacrylonitrile fiber. pounds was methylated with dimethyl sulfate in di- The procedures above-mentioned were repeated exmethyl formamide and salted out by means of sodium cept that ethyl p-toluene sulfonate and propyl pchloride and zinc chloride to obtain the various dyetoluene sulfonate were employed as methylating agent, stuffs given in the Table 4.

respectively. These dyestuffs can dye polyacrylonitrile in the The dyestuffs of the following formulae were obshades given in the Table and have excellent fastness to tained: light and to heat.

EXAMPLE 4s acid (2 parts.) and 50 percent tartaric acid (1 part) were dissolved in a suitable amount of warm water, then the solution and the thickener (60 parts) were mixed thoroughly and 50 percent resorcive 4 parts) was added to the mixture to prepare 100 parts of a printing paste.

Polyacrylonitrile fabric was printed with the printing paste, dried at 50C and steamed at 100C for 30 minutes. Then, the printed fabricwas washed with water, soaped at 70C for 20 minutes, washed with water again and dried. The printed fabric was a brillant red-, dish yellow and had excellent fastness to light.

Following Table 5 lists a number of further dyestaffs prepared according to this invention, Amax. thereof and shade when the dyestuffs are applied onto polyacrylonitrile fiber.

TABLE 5 Amax. Shade u) C H; C H; 9 Yellow 35 r on, on;

I l 91 CC=NN Cl OHSO] CH; CH; e i .do 44o l CH3 CH3 l e: /CC=NN CzHs CH SO: CH3 I CH; CH; 8 Reddlsh yellow 460 CH CH 01 I a a 1 e /CC=N-N OCH; ZnClz CH;

r CH: CH; Q -dO 457 $H3 (1H3 C--C=NN KQP 04 I CH3 F 05a CH3 Yellow 448 CH CH; l

CC- NN-- CH: ZnC];

i CH3 Ha H3 do 432 r r e CC=NN- OCH; o1

l H; CH: e do 452 CH3 CH3 omo I e C- :N-N --OCH; 211C];

TABLE Conlinued )rmax. Shade (mp) 0H, on, a do 45 CH; CH, 02H; l e

OC N-N CH ZnCl;

i CH;

l" Cg; CH; 63 Greenlsh yellow-.. 435

\ CH3 CH3,

I e C'C=N-N ZnCl;

1 Dyestufi 1 is prepared by quaternarlsation with dlmethyl sulfate and saltlng out with sodium chloride. 2 Dyestufi 2 is prepared by quaternarlsatlon with p-toluene sulfonlc'ac'id and salting out with sodium chloride. 1 Dyestufi 3 is recovered by salting out with sodium chloride and acid potassium phosphate.

What is claimed is:

1. A cationic dyestuff having the formula:

wherein R represents a lower alkanoyl, R represents hydrogen, a lower alkyl group selected from the group consisting of methyl, ethyl, propyl and butyl, a substituted lower alkyl group selected from the group consisting of cyanoethyl,carbamoylethyl,chloroethyLoxyethy l fiioxypropyl, methoiiyethyLethoxyethyl, y-chlorofi-hydroxy' propyl, 'y-methoxy-B-hydroxy propyl, B-dimethyl aminoethyl and B-diethyl aminoethylpr benzyl, X represents hydrogen, nitro,halogen,lower alkyl or lower alkoxy; A represents benzene or naphthalene,or 

2. The dyestuff of claim 1, wherein the Y anion may be selected from the group consisting of formate,acetate, oxalate, p-toluene sulfonate,sulfamate,N-substituted sulfamate, phosphate,alkali metal phosphate,halide, acid phosphate of polyhydric alcohol, sulfate, alkyl sulfate, perchlorate,zinc halide, and hydroxyl. 